This 7 June 2020 video says about itself:
The Mantled Howler Monkey is the loudest animal of the rainforest
The Mantled Howler Monkey (Alouatta palliata) is one of the most prominent species of monkeys in the beautiful country of Panama. It thrives in deep lush jungles along the Canal of Panama and spends most of the day in the canopy of large mature tropical trees. Its home is typically the hostile and busy rain forests of most of Central and South America.
Like most of its cousins, the Mantled Howler will likely eat anything smaller than its own size. On the other hand, its natural predators are mainly feline like the jaguar and puma among other big predatory cats. The infamous loud and threatening sounding call of the Mantled Howler Monkey resonates over the thick dramatic and stunning vegetation of the Gamboa region and can be heard far in the distance through the jungle.
Among 5 other relatives of monkey species present in Panama, the Mantled Howler also shares its beautiful natural habitat with dozens of other mammal species and hundreds of bird species. Footage in this two-hour continuous uninterrupted calm and relaxing compilation was filmed in 4K Ultra High Definition in the evergreen humid rain forest of the lush Pipeline Road hiking trail in Gamboa, Panama.